SAs are used to index session keys and initialization vector. This is a unidirectional channel negotiated by IPSec, with a pair of SAs required for two-way communication. An implementation of a client keepalive functionality, to check the availability of the VPN device on the other end of an IPSec tunnel. IPSec can protect one or more data flows between a pair of hosts, between a pair of security gateways, or between a security gateway and a host.ĭPD-Dead peer detection. IPSec uses IKE to handle the negotiation of protocols and algorithms based on local policy and to generate the encryption and authentication keys to be used by IPSec. IPSec provides these security services at the IP layer. A framework of open standards that provides data confidentiality, data integrity, and data authentication between participating peers. This can be done by manually entering preshared keys into both hosts or can be done by a certification authority (CA) service. Before any IPSec traffic can be passed, each router/firewall/host must verify the identity of its peer. IKE establishes a shared security policy and authenticates keys for services (such as IPSec) that require keys.
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